کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7726029 1497854 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Analysis of cerium-composite polymer-electrolyte membranes during and after accelerated oxidative-stability test
ترجمه فارسی عنوان
تجزیه و تحلیل غشاهای الکترولیتی پلیمر الکترولیتی سریم کامپوزیت در طول و پس از تست اکسایش پایدار
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
The oxidative stability of membranes constructed from a composite of pristine sulfonated poly(arylene ether sulfone) and cerium was investigated by conducting an accelerated oxidative-stability test at the open-circuit voltage (OCV). The membranes were analyzed in situ through OCV and impedance measurements, cyclic voltammetry, and linear-sweep voltammetry to monitor the electrochemical properties during the stability test. Although the high-frequency resistance of a composite membrane was slightly higher than that of a pristine membrane because of the exchange of protons from the sulfonic acid with cerium ions, the composite membrane maintained its potential for much longer than the pristine membrane. The effect of the cerium ions as radical scavengers was confirmed by analyzing the drain water and chemical structure after operation. These post-operation analyses confirmed that cerium ions improved the oxidative stability of the hydrocarbon-based polymer during fuel-cell operation. It is clear that the cerium-based radical scavengers prevented chemical degradation of the polymer membrane as well as the electrode in terms of hydrogen cross-over, polymer-chain scission, and the electrochemical surface area, while they rarely diffused outward from the membrane.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 378, 28 February 2018, Pages 468-474
نویسندگان
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